Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
RFQ CartGet a QuoteSign inSign up
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 300 psig Max. Static Pressure - Differential Pressure Indicators
MIDWEST INSTRUMENTDifferential Pressure Indicators

MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 300 psig Max. Static Pressure

The MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator (MPN 555A-3.5) is a differential pressure indicator with a maximum static pressure of 300 psig. It features an accuracy of ±5% (0-3.5 psid to 0-43 psid)…

SKU 3G-OTH-174401

Brand
MIDWEST INSTRUMENT
Item
3-Color Differential Pressure Indicator: 300 psig Max. Static Pressure
Category
Differential Pressure Indicators
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Technical Specifications

MIDWEST INSTRUMENT
Manufacturer Part Number
555A-3.5
Type
Static Pressure, 555A
Accuracy
±5% (0-3.5 psid to 0-43 psid)
Sensor Material
Buna-N
Housing Material
Glass-Filled Nylon
Transition Points
0 psid to 2 psid (Green) / 2 psid to 2.5 psid (Yellow) / 2.5 psid to 3.5 psid (Red)
View Full Spec Sheet

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

MIDWEST INSTRUMENT Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator (MPN 555A-3.5) is a differential pressure indicator with a maximum static pressure of 300 psig. It features an accuracy of ±5% (0-3.5 psid to 0-43 psid), a Buna-N sensor, and a glass-filled nylon housing. The indicator uses three color transition points: green from 0 psid to 2 psid, yellow from 2 psid to 2.5 psid, and red from 2.5 psid to 3.5 psid.

Frequently Asked Questions

What is the MIDWEST INSTRUMENT 555A-3.5 differential pressure indicator used for?

The MIDWEST INSTRUMENT 555A-3.5 is used to visually indicate differential pressure in industrial fluid systems. Its three-color display (green, yellow, red) provides at-a-glance status for filter condition, flow monitoring, or process control, helping operators quickly identify normal, caution, or alarm states.

What are the specifications of the MIDWEST INSTRUMENT 555A-3.5?

The MIDWEST INSTRUMENT 555A-3.5 has a maximum static pressure of 300 psig, accuracy of ±5% (0-3.5 psid to 0-43 psid), a Buna-N sensor, and a glass-filled nylon housing. Transition points are: green from 0 psid to 2 psid, yellow from 2 psid to 2.5 psid, and red from 2.5 psid to 3.5 psid.

Where to buy the MIDWEST INSTRUMENT 555A-3.5 worldwide?

You can source the MIDWEST INSTRUMENT 555A-3.5 through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time; we provide this differential pressure indicator to customers across multiple industries.

How to install the MIDWEST INSTRUMENT 555A-3.5 differential pressure indicator?

Install the MIDWEST INSTRUMENT 555A-3.5 by connecting it to the pressure ports per the manufacturer's instructions, ensuring proper sealing with compatible fittings. Mount the indicator in a location free from excessive vibration. Verify the transition points align with your system's setpoints before commissioning. Always follow standard industrial safety practices.

Used in

Common applications for MIDWEST INSTRUMENT
Filter monitoring in industrial water treatment — MIDWEST INSTRUMENT 522 series 3-color differential pressure indicators
Flow measurement in chemical processing — MIDWEST INSTRUMENT Series 120 piston-type differential pressure gauges
Liquid level indication in oil and gas storage tanks — MIDWEST INSTRUMENT Model 142 diaphragm-type differential pressure gauges
HVAC system filter condition monitoring — MIDWEST INSTRUMENT Series 130 differential pressure gauges with glass-reinforced plastic housing
Pump differential pressure monitoring in industrial plants — MIDWEST INSTRUMENT 522 series indicators with switch for alarm output

MIDWEST INSTRUMENT Products

3G Electric supplies MIDWEST INSTRUMENT differential pressure indicators. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Similar products

Matched by specification & description
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 300 psig Max. Static Pressure, 555A (MPN 555A-5.0). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% (0-3.5 psid to 0-43 psid); Sensor Material: Buna-N; Housing Material: Glass-Filled Nylon; Transition Points: 0 psid to 3 psid (Green) / 3 psid to 4.5 psid (Yellow) / 4.5 psid to 5 psid (Red).
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 300 psig Max. Static Pressure, 555A (MPN 555A-5.0). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% (0-3.5 psid to 0-43 psid); Sensor Material: Buna-N; Housing Material: Glass-Filled Nylon; Transition Points: 0 psid to 3 psid (Green) / 3 psid to 4.5 psid (Yellow) / 4.5 psid to 5 psid (Red).
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 300 psig Max. Static Pressure, 555A (MPN 555A-10.0). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% (0-3.5 psid to 0-43 psid); Sensor Material: Buna-N; Housing Material: Glass-Filled Nylon; Transition Points: 0 psid to 5 psid (Green) / 5 psid to 7.5 psid (Yellow) / 7.5 psid to 10 psid (Red).
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 300 psig Max. Static Pressure, 555A (MPN 555A-10.0). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% (0-3.5 psid to 0-43 psid); Sensor Material: Buna-N; Housing Material: Glass-Filled Nylon; Transition Points: 0 psid to 5 psid (Green) / 5 psid to 7.5 psid (Yellow) / 7.5 psid to 10 psid (Red).
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 300 psig Max. Static Pressure, 555A (MPN 555A-15.0). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% (0-3.5 psid to 0-43 psid); Sensor Material: Buna-N; Housing Material: Glass-Filled Nylon; Transition Points: 0 psid to 7.5 psid (Green) / 7.5 psid to 12 psid (Yellow) / 12 psid to 15 psid (Red).
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 300 psig Max. Static Pressure, 555A (MPN 555A-15.0). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% (0-3.5 psid to 0-43 psid); Sensor Material: Buna-N; Housing Material: Glass-Filled Nylon; Transition Points: 0 psid to 7.5 psid (Green) / 7.5 psid to 12 psid (Yellow) / 12 psid to 15 psid (Red).
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 300 psig Max. Static Pressure, 555A (MPN 555A-12.0). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% (0-3.5 psid to 0-43 psid); Sensor Material: Buna-N; Housing Material: Glass-Filled Nylon; Transition Points: 0 psid to 6 psid (Green) / 6 psid to 9 psid (Yellow) / 9 psid to 12 psid (Red).
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 300 psig Max. Static Pressure, 555A (MPN 555A-12.0). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% (0-3.5 psid to 0-43 psid); Sensor Material: Buna-N; Housing Material: Glass-Filled Nylon; Transition Points: 0 psid to 6 psid (Green) / 6 psid to 9 psid (Yellow) / 9 psid to 12 psid (Red).
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 300 psig Max. Static Pressure, 555A (MPN 555A-30.0). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% (0-3.5 psid to 0-43 psid); Sensor Material: Buna-N; Housing Material: Glass-Filled Nylon; Transition Points: 0 psid to 13 psid (Green) / 13 psid to 20 psid (Yellow) / 20 psid to 30 psid (Red).
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 300 psig Max. Static Pressure, 555A (MPN 555A-30.0). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% (0-3.5 psid to 0-43 psid); Sensor Material: Buna-N; Housing Material: Glass-Filled Nylon; Transition Points: 0 psid to 13 psid (Green) / 13 psid to 20 psid (Yellow) / 20 psid to 30 psid (Red).
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 1,000 psig Max. Static Pressure, 522 (MPN 522A-005V). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% of Full Scale; Sensor Material: Viton; Housing Material: Aluminum; Transition Points: 0 psid to 3 psid (Green) / 3 psid to 4 psid (Yellow) / 4 psid to 5 psid (Red).
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 1,000 psig Max. Static Pressure, 522 (MPN 522A-005V). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% of Full Scale; Sensor Material: Viton; Housing Material: Aluminum; Transition Points: 0 psid to 3 psid (Green) / 3 psid to 4 psid (Yellow) / 4 psid to 5 psid (Red).

More from MIDWEST INSTRUMENT

View all MIDWEST INSTRUMENT parts →
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 300 psig Max. Static Pressure, 555A (MPN 555A-25.0). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% (0-3.5 psid to 0-43 psid); Sensor Material: Buna-N; Housing Material: Glass-Filled Nylon; Transition Points: 0 psid to 11 psid (Green) / 11 psid to 18.5 psid (Yellow) / 18.5 psid to 25.5 psid (Red).
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 300 psig Max. Static Pressure, 555A (MPN 555A-25.0). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% (0-3.5 psid to 0-43 psid); Sensor Material: Buna-N; Housing Material: Glass-Filled Nylon; Transition Points: 0 psid to 11 psid (Green) / 11 psid to 18.5 psid (Yellow) / 18.5 psid to 25.5 psid (Red).
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 1,000 psig Max. Static Pressure, 522 (MPN 522S-015V). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% of Full Scale; Sensor Material: Viton; Housing Material: Stainless Steel; Transition Points: 0 psid to 7.5 psid (Green) / 7.5 psid to 11 psid (Yellow) / 11 psid to 15 psid (Red).
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 1,000 psig Max. Static Pressure, 522 (MPN 522S-015V). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% of Full Scale; Sensor Material: Viton; Housing Material: Stainless Steel; Transition Points: 0 psid to 7.5 psid (Green) / 7.5 psid to 11 psid (Yellow) / 11 psid to 15 psid (Red).
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 1,000 psig Max. Static Pressure, 522 (MPN 522S-025V). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% of Full Scale; Sensor Material: Viton; Housing Material: Stainless Steel; Transition Points: 0 psid to 11 psid (Green) / 11 psid to 18.5 psid (Yellow) / 18.5 psid to 25 psid (Red).
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 1,000 psig Max. Static Pressure, 522 (MPN 522S-025V). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% of Full Scale; Sensor Material: Viton; Housing Material: Stainless Steel; Transition Points: 0 psid to 11 psid (Green) / 11 psid to 18.5 psid (Yellow) / 18.5 psid to 25 psid (Red).
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 1,000 psig Max. Static Pressure, 522 (MPN 522S-030V). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% of Full Scale; Sensor Material: Viton; Housing Material: Stainless Steel; Transition Points: 0 psid to 13 psid (Green) / 13 psid to 20 psid (Yellow) / 20 psid to 30 psid (Red).
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 1,000 psig Max. Static Pressure, 522 (MPN 522S-030V). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% of Full Scale; Sensor Material: Viton; Housing Material: Stainless Steel; Transition Points: 0 psid to 13 psid (Green) / 13 psid to 20 psid (Yellow) / 20 psid to 30 psid (Red).
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 1,000 psig Max. Static Pressure, 522 (MPN 522A-030V). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% of Full Scale; Sensor Material: Viton; Housing Material: Aluminum; Transition Points: 0 psid to 13 psid (Green) / 13 psid to 20 psid (Yellow) / 20 psid to 30 psid (Red).
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 1,000 psig Max. Static Pressure, 522 (MPN 522A-030V). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% of Full Scale; Sensor Material: Viton; Housing Material: Aluminum; Transition Points: 0 psid to 13 psid (Green) / 13 psid to 20 psid (Yellow) / 20 psid to 30 psid (Red).
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 1,000 psig Max. Static Pressure, 522 (MPN 522P-015). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% of Full Scale; Sensor Material: Buna-N; Housing Material: Acetal Plastic; Transition Points: 0 psid to 7.5 psid (Green) / 7.5 psid to 11 psid (Yellow) / 11 psid to 15 psid (Red).
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 1,000 psig Max. Static Pressure, 522 (MPN 522P-015). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% of Full Scale; Sensor Material: Buna-N; Housing Material: Acetal Plastic; Transition Points: 0 psid to 7.5 psid (Green) / 7.5 psid to 11 psid (Yellow) / 11 psid to 15 psid (Red).
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 300 psig Max. Static Pressure, 555A (MPN 555A-43.0). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% (0-3.5 psid to 0-43 psid); Sensor Material: Buna-N; Housing Material: Glass-Filled Nylon; Transition Points: 0 psid to 19.5 psid (Green) / 19.5 psid to 29.5 psid (Yellow) / 29.5 psid to 43 psid (Red).
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 300 psig Max. Static Pressure, 555A (MPN 555A-43.0). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% (0-3.5 psid to 0-43 psid); Sensor Material: Buna-N; Housing Material: Glass-Filled Nylon; Transition Points: 0 psid to 19.5 psid (Green) / 19.5 psid to 29.5 psid (Yellow) / 29.5 psid to 43 psid (Red).
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 1,000 psig Max. Static Pressure, 522 (MPN 522P-010). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% of Full Scale; Sensor Material: Buna-N; Housing Material: Acetal Plastic; Transition Points: 0 psid to 5 psid (Green) / 5 psid to 7 psid (Yellow) / 7 psid to 10 psid (Red).
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT 3-Color Differential Pressure Indicator: 1,000 psig Max. Static Pressure, 522 (MPN 522P-010). Key specifications — Brand: MIDWEST INSTRUMENT; Accuracy: ±5% of Full Scale; Sensor Material: Buna-N; Housing Material: Acetal Plastic; Transition Points: 0 psid to 5 psid (Green) / 5 psid to 7 psid (Yellow) / 7 psid to 10 psid (Red).